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Locator: IO93IR WAB: SE42
23 G2 Transverter kit
23 G2 Transverter kit
With a RF power meter connected to the output of my Kuhne '23 G2' transverter I noticed RF spikes with or without any drive while switching from receive to transmit and back to receive again. The issue might be unique to my setup however I decided to compare the DC TX/RX switching circuit in my transverter with the later '23 G3' model.
The following modification takes the RX/TX DC switching circuit of the later '23 G3' and integrates it into my '23 G2' transverter. After producing a prototype on veroboard a much smaller board using surface mount devices was produced in Kicad so it could be mounted inside the transverter. After fitting the board I am not seeing any more RF spikes when I press and release the PTT.
Unmodified Rx to Tx
Unmodified Rx to Tx
Yellow trace RX_+5V, 78L05 output
Blue trace TX _+10v, L4940 output
Modified Rx to Tx
Modified Rx to Tx
Yellow trace RX_+5V, 78L05 output
Blue trace TX _+10v, L4940 output
Unmodified Tx to Rx
Unmodified Tx to Rx
Yellow trace RX_+5V, 78L05 output
Blue trace TX _+10v, L4940 output
The 5v receive rail becomes active before the 10v Tx rail has dropped to zero.
Modified Tx to Rx
Modified Tx to Rx
Yellow trace RX_+5V, 78L05 output
Blue trace TX _+10v, L4940 output
Modified Rx to Tx
Modified Rx to Tx
Yellow trace PTT input line
Blue trace TX _+10v, L4940 output
Modified Tx to Rx
Modified Tx to Rx
Yellow trace PTT input line
Blue trace TX _+10v, L4940 output
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